Drill sharpener



Feb. 13. 1945; E F. wicKENs 2,369,627

DRILL s-HARPENER Filed Dec. 3, 1943 E? 2E E0 I J I -Il [A IIIIV A BML-1 HI 5 ATTORNEY.

'K its movableparts and objectionable feature :in

` @which iis, Iinvariably fatuthe :whereitheifmging mperationziis v,tlleing performed.

Patented Feb. 13, 1945 n fnnpnestinafnember s', 194:, semi-nassaui i l mias-isi) e 'l"minimisationfeiatesftofcrging maemaesfanu 'more vparticularly'its theftype offorgingimaoliine e known 'as drill-Sharpeners;

'-f"During-aircrew;operationen.machmesofams ly transmitted :throughout l :the machine. rand causes expansion of and :often :excessive wear fon many machines of Vthis gtype'is'zthatthetvaive iniechanism controlling the f'supply y:of rpressure iluid -to the :various `portions of the .'mac'hine :is eexposed to ithe fatmospher'e. 'Buch valve mechanisms; must, :of :necessltm :tbe flooated `conveniently `i-.the foperators -position laside. zo'f fthemachine Thus .in structures which :the valve :mechanis-mais directlyzexposedito zth'eatmcspherezmany of the scale parti'clesilying-:fromthe workspiece lodge' @upon .the valve vand ycause 'undue fw'e'ar'.- on

.thelyalve mechanism.

:In laccordancewith'fthepractice of the inven ltlong it-sis `contemplated to` minimize `=the trans lini'ssionrnf :heat 'from .theworkzto ihelbearing l 'miriac'esun the machine. i

Itiis a ,furtherobiectto.:preventxcessivemear :the .control valize'.n'ie'ch'aanismE of .the.- machine; .iobviou's zand :in

part pointed out hereinafter.

an Ithe "drawing l'aoc'on'ip'anying Athis fspeciflcaation and in .whichzsimilarsreferencesnumerals Tre"- 'fertosimilarpartgi v, i f l Figure' :1 :.isza side levatlonvof a drlll'sharpenimg zma'chlne onstructed in `accordance with the fpracticefof theinventlom i. Figure 2 is a lsimilar view, lpartlybrokenlfaway, mshowing :the lvalve 'mechanism housedntirely zwithinzthemainiframe for the Isharpener, v.and I Figure :aus aii end elevation, partly `v`broken away, of .the rf drill sharpening" machine. `=fRe`ferring more particularly 5to fthe -drawi-ng, the drill "Sharpener",l designated yin` genral by l"20, comprises a mainframe 2| and a crosshead 22 overlying- 'the lmai-'rl 'fa'n'ie vThe uppermost portion of the main frame 2| constitutes an anvil block 23, and in the opposed surfaces of the anvil block and the crosshead 22 are forming'l dies 24 and 25, respectively, that are suitably recessed to shape,'for example, the cutting end of a drill steel 26. On the side `of the framev 2| is a bracket 21 to support a percussive tool 28 serving to actuate a dolly 29 for forming the vcutting teeth 30 on the drill steel 26.

Within the main frame 2| is a piston chamber 3| containing a piston 32 that is connected to their bearings. '.Azfzfurther i the crosshead 22 by a pair"ofclumnsfsslldalle vertically --in the mainframe. The y'c'olurmis' y 33 may, as Tis explained "fmore y'fully in'U tilted States 'Patent .'No. 1,81'2304 lto '5Pters, ite'n with their lower portions -bel'ow the piston 32int'oigul'de k.r'syliriiiers 134 "in the main 1"frame ito 'assls'tn sguid -in'g 'the yreciprocater-:velementsfoi the Jsha-rperret'. patentftheowerehds Thusas-infthe aforesaid which pressure fluid :is

are subjected constantly to pressurefiluid :fior yraisingthe piston'f32 vand the parts connected thereto.- Suchlpressu'reiuidis admitted 'fn'to the guide icylinders 34=`ithroueh ports '36 Heading from a supply passage 31fi'n the lower portion of Ithe main'f`fran'1e', and #pressure A"fluid is conveyed @to lthe supply passage -31 'from a suitable fso'urjee y*of expansible pressure fluid supplyby y:a"conduitWl 4`threadedly(':onnected'tothefmain v'frarm'e.f

y The lowerportioni-cfthe pistoncharnber3| iis in constant communicationlwith the atmosphere througheaportBS opening into va discharge pasi v'sage 4|!` in the main framejbeneaththe :piston Vehan'riber 13 -and an 1 outlet f4| for 4the 1discharge passage.- The fupper' portion of the V pistonfchainL bei `"3l constitutes #a pressure chamber ft2 -into selectively introduced "through an firilet passage 43 to act against upper or l'actuating 'surface jMfo'f 'the ypistxln'i32 'foreectingfclamping"movement'thereon The'inlet passage-lfservesfto convey pressure fluidy to the ypiston chamber` `and. exhaust liluii'l therefrom.; It `opens axially "into the fpiston chamber, and onv the upper surface o'f the piston 532 is la projection 54,51 of slightly smaller "diameter .than the inlet ypassage -43 whichitfenters', `z'azsithe pistonv 32 approaches the end `of 'its upwardl stroke, to valve the uid "from the pressure nchai'r'ber 42 fat-fa sufficiently -slow rate to prevent 'thesharp impact of the piston against the end wall ofthe piston chamber. l A

Preferably, a shallow annular recess "4B fls irformed in thel upper vfend offthe piston'chanlber karound lthe inlet passage 4'3, wherewithit 'coing 'luliiclte |10 "assur the initial exposure O' "a suitable area of the actuating surface 44 to pressure fluid for starting the piston 32 on its ydown-4 Ward or clamping stroke.

Inthe arrangement shown, the main frame is a passage munlcation between ber -41. The chamber 41 has an outlet passage 49 that leads to a valve mechanism 50 attached to the side of an `interior wall 5| of the main frame2l.

ment 28 for driving the dolly 29 against the work piece.

Upon ycompletion of the Work, the valve 62 is moved downwardly to place the head '64 in position to seal the ports 51 and to effect communication between the ports `58 and 6| through the annular recess 63. The uid in the piston chamber and the casing are further provided with ports 59,y Y that communicate with a supply passage 60 extending through the main 21 to the percussive tool 28.

The ports `51 are located between the ports 59'V frame and the bracket l|12 will then pass through the ports 6| into the exhaust chamber 1|, thence throughthe-passages 1,-2 and `11|) to the atmosphere. In thus owing through the exhaust chamber 1| the expanded "fluid will carry away much of the heat transv imitted to the anvil block :by the work-piece and some of the oil entrained in the exhaust uid and 58 so that pressure fluid may be selectively@l valved from supply to either of the passages 60 and 43 or simultaneously to both, and in the:

sleeve 55 and the casing |52, below the ports '58 are exhaust ports 6| for the escape of fluid fromy the pressure chamber `|12.

g n, Within the valve chamber 56 is a reciprocatory valve '62 having an intermediate annular lrecess 63 and upper and lower end heads 61| and 65, resDBCtiVely. The annular recess 63 is of such length that, in a given position of the valve,.it will s place both the ports 59 and I58 in communication withthe ports `51 for actuating the piston 32 on its clamping stroke and to simultaneously operate the percussive tool 28.

The valvev |52 is of the manually actuated type. Zitv has a stem 6,6 Iat its upper end pivotally connected to arocker 61 on a shaft Sis journaled in bearings 69 in the main frame 2|. On an end of theshaft :68 projecting .exteriorly of the'main frame is a crank 70, for rocking the shaft to raise and lower the valve 62. n

The space in the main frame 2| containing the valve mechanism constitutes an exhaust chamber 1| that is located `between the piston chamber 3| and the anvil block 23 and communicates with the exhaust passage I4|) through a passa-ge 12. The exhaust `chamber 1| extends upiwardlyto the anvil block portion 23 of the main frame which will, therefore, be exposed to the cooling influence ,ofthe` fluid exhausted into the chamber 1| from the pressure chamber 42. In the side of the main frame 2| adjacent the valve mechanism 50 is an opening 13 to admit of access to the valve mechanism and said opening is normally sealed by a plate 141 secured to the main frame by bolts 15.`

11n the operation of the device, the^piston 32 `and the parts connected thereto are raisedto their uppermost limiting positions by the pressure fluid acting against the surfaces 35 of the rods 3:3, and lpressureriiuid is selectively valved into thepressure chamber `||2 for actuating the piston in the opposite direction. .Thusby placing the valve 62 in position to communicate the ports 58 and '59 with the port 51 pressure fluid will flow into .the

piston chamber `42 and move the piston 32 and the crosshead downwardly to clamp the work-piece between the dies. Pressure fluid Ywill then also flow through the passage 60 tothe percussive eleentering the ends of the sleeve '55 from thechamber `1| ,will be deposited upon the Wall of the valve chamber and eiect the thorough lubrication of f these important surfaces.

, -A further highly desirable feature of the present invention is that the valve mechanism lies .in a dirt-free atmosphere and will, therefore, be -weli shielded from the. dust and abrasive matter resulting from the forging oper-ation. YIn consequence, these costly parts may operate for long periods of time ,without renewal and without necessitating frequent delays for the purpose of kinspection and servicing.

' I claim: Y I

A drill Sharpener, comprising a casing having a cylinder and an inlet chamber, there being an exhaust chamber above the'cylinder, an anvil block on the casing above the exhaust chamber, a crosshead, a fluid actuated piston in the cylinder for eecting reciprocatory movement of the crosshead relatively to the anvil block, and valve means .inone of the chambers for controlling the iiow of expansible pressure fluid to and the exhaust of fluid from the cylinder and being housed entirely within and enclosed by the casing.

1, 2. A drill Sharpener, comprising a casing having a cylinder and inlet and exhaust chambers labove the cylinder, an anvil block on the casing above the chambers, a crosshead, a fluid actuated piston in the cylinder to actuate the crosshead relatively to the anvil block, and valve means for controlling the flow of expansible pressure uid yto and the exhaust of such. fluidfrom rthe cylinder and being located entirely fwithin the exhaust chamber.

3. A drill Sharpener, comprising a casing hav- -ing a cylinder, an anvil block on the casing, a crosshead, a piston in the cylinder for eifecting reciprocatory movement` of the crosshead relatively to the anvil block, an exhaust chamber in the casing between the anvil block and the cylinder, and Valve means for controlling the flow of ex-pansible pressure fluid to the cylinder and the exhaust of fluid from the cylinder to the exhaust chamber located entirely Within the exhaust chamber` and havingv portions thereof exposed to the exhaust fluid and entrained oil in the exhaust chamber for oiling the valve mechanism.

' EDWARD FQWICKENS. 

